As was reported about two weeks prior, Riot Games is now moving to install a 10-ban system for the upcoming competitive split. As declared by Meddler:
A while ago we talked about how we were considering changing to a 10 ban system. We’ve now got an approach we’re happy with that we’ll be using for Pro-Play in all leagues run by Riot.
Meddler's also confirmed that the timing of each phase has also been adjusted to minimize how long it takes to actually enter the game.
There are. We'll be moving to 30s per phase rather than the current 60s.
The full system in pro play will look like so:
Riot's noted that the implementation for ranked games is yet to come, and won't be identical to the system now used in the competitive circuits. But either way, the reaction to it has been almost universally positive.